Home Cosmetic Science Talk Formulating Room Spray Recipe

  • Room Spray Recipe

    Posted by unsightlyangel on August 2, 2023 at 11:46 am

    Hi All,

    I wonder if I can get advice on how to make my room sprays last long when sprayed. I have been reading about fixatives but it seems to be very mixed reactions. I currently use glycerin at 10% but now I’m wondering if it really does any work. I use fragrance at 7%, ethanol at 83%.

    Any advice will be appreciated.

    Thank you

    fareloz replied 6 months, 2 weeks ago 7 Members · 9 Replies
  • 9 Replies
  • fareloz

    August 2, 2023 at 4:23 pm

    Obvious way - increase amount of the fragrance.

    Also, different fragrances last different amount of time. Try to change the fragrance.

    You could also use a fixative. Some suppliers sell premade base for perfumes, it contains fixative in right amount. You could buy it, it is easier to find and cheaper than buy fixative in bulk and dilute.

    If you want a persistent smell you might change the product type, like instead of spray use a diffuser - a jar with special sticks that evaporates fragrance from the jar at some rate and gives constant smell. Disadvantage - you can’t “turn it off”

  • ozgirl

    August 2, 2023 at 5:42 pm

    Have you considered adding some water to your formula? Water is added at some level to most perfumes. It’s slower evaporation rate (when compared with ethanol) might give you the result you need.

    Is 10% glycerin sticky when it dries?

  • Fedaro

    August 2, 2023 at 10:27 pm

    @ozgirl @fareloz

    hello, i actually had the same question. i have tried fragrance at 5%, 10%, and 20% (staying within IFRA category 10B max usage level for each fragrance i tried). i also tried adding DPG at 1:1 and 2:1 ratios with the fragrance and the rest is ethanol (sold as perfumer’s alcohol, 200 proof nondenatured).

    however, the smell does not last long or linger. it is nice and strong when first sprayed but vanishes in less than an hour. i tried spraying the carpets in my car at night and the smell was completely gone in the morning, but i have used some sprays where the smell remains noticeable for 2-3 days, such as the ones by Bluntpower and BluntEffects.

    any suggestions would really appreciate it, thank you so much

    • fareloz

      August 3, 2023 at 5:09 am

      They use specific fragrance blends for the purpose. Also, by “perfume base” in other comment I meant a solution of ethanol, PG or DPG and Benzyl benzoate and/or diethyl phthalate. Two latter are considered as fixatives.

      If you need a lingering smell I would personally suggest to just use other format of the product - diffuser, which stays in the car and lingers smell constantly.

      • Fedaro

        August 8, 2023 at 12:37 pm


        thank you, i misunderstood the use of DPG, i thought it was a fixative in this case. could you recommend me a starting point for how much benzoyl benzoate or diethyl phthalate to add? is one preferred over the other?

        also, about the BluntPower air freshener, this is what they say on their website:

        Sadly, most ‘Big Brand’ air fresheners use mass-produced water and alcohol-based sprays that disappear FAST. Instead, we use a unique, oil-based formula that’s designed to hang around and fill any room. Just a few sprays will literally last for days. As an added bonus, you can also use BluntPower inside your oil burner.

        what would go into an oil-based air freshener that doesn’t contain water or alcohol?

        thank you so much for your time and help.

        • fareloz

          August 8, 2023 at 2:45 pm

          I am sorry, I am not an expert in the field. I only know that my supplier sells perfume alcohol which contains around 0.01 - 0.5% of diethyl phthalate as a fixative.

  • Raychemist

    August 3, 2023 at 9:21 am

    You might consider mixing perfumes into top notes, medium notes and base notes. This might help with the long-lasting effect needed. Additionally, try using alcohol in the percentile range of 60 to 75. The percentage of glycerin is high, maintaining a rate of 3 to 5% should do the trick. Hope this works for you

  • mikethair

    August 4, 2023 at 5:54 pm

    It’s all to do with the fragrance formulation and the right balance of top, middle, and base notes.

    I formulated and manufactured various room sprays for brands globally, and never had problems.

  • suswang8

    August 5, 2023 at 9:40 pm

    I’m not sure there is a way to make a natural room spray last long. I think that 7% fragrance is already pretty high, but increasing it might provide the effect you need.

    I am curious who recommended the glycerin to you, and especially that high, but perhaps they know something we don’t (i.e., it sticks to a surface and evaporates more slowly?)

    I also think you should increase the amount of water. Why don’t you try something like 75% ethanol, 18% water, and 7% fragrance, as a start and see if you notice a difference from your current blend?

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